Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5150928 | Coupling sleeve for connection of a branch pipe to a main pipe | Bernhard Lodder, Berend Jan Van Dijk, Adriaan Paulen | 1992-09-29 |
| 4441744 | Branch pipe part | Anno G. Negen, Marinus L. G. van Kaam | 1984-04-10 |